1991 GMC Vandura 3500 Questions

Get answers to questions about your 1991 GMC Vandura 3500 at RepairPal. Find solutions, diagnose problems and get back on the road.

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When we purchased the van, the serpentine belt began coming off after hitting a large patch of water. Father-in-law, who was very mechanically savvy, said van had larger than normal alternator and needed a 955 belt instead of the recommended 945. Put on 955, ran great until a week ago, belt came off, was shredded and bits wrapped around fan post. New belt (955) flies off immediately, and fan area where belt sits (only non-grooved portion of belt system) is completely smooth. Friend suggesting removal of fan cover to see where issue may be - not sure how to do that, nor why belt may be flying off. Any help would be fantastic.

It a passenger truck with no reverse. It runs forward ok but I want to replace the transmission instead of rebuilding it. Thanks.